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single treatment plant or outfall sewer can be constructed to serve them all. |
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3.2.10
Institutional Capacity |
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Sewerage schemes are predominantly implemented, operated and maintained by institutions. Often an institution exists before a scheme commences and it is expected to expand to encompass the new duties necessary for a scheme's construction and operation. An institution's ability to cope with the demands of a new sewerage scheme will greatly affect that scheme's long-term success, both technically and financially. Communities having institutions with the capacity to encompass new commitments and responsibilities efficiently and competently should be favoured in any selection process over communities having institutions that cannot. Decisions on an institution's capacity to cope with added commitments should be based on an institutional evaluation. |
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One of the main reasons for considering sewerage is to improve standards of health, although not all schemes will produce the same health benefits. Improvements in health will depend on the existing levels of health which, in turn, will partially depend on current levels of sanitation and hygiene practice. It is rarely possible to quantify improvements in health resulting from the provision of sewerage because of the number of variables involved. In most situations it may be assumed that similar schemes will produce similar health benefits. |
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3.3
Numerical Analysis of Need and Viability Criteria |
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Having decided which criteria affect the ranking of a group of proposed sewerage schemes it is necessary to determine which of the schemes should have priority for implementation. This chapter recommends a numerical analysis as follows: |
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